Dung Session joomla luu url truoc do

$currentURL=JURI::current();
//$currentURL = JFactory::getURI();

 $session =& JFactory::getSession();
$session->set( 'currentURL',base64_encode($uri->toString()) );

==> lay tham so truyen qua

$session =& JFactory::getSession();
$currentURL = base64_decode($session->get('currentURL'));